“Our investigation teams are continuing to work hard to piece together the events of that evening,’' Symonds said.
“And while three arrests have been made, there are still a number of enquiries yet to be completed, however, we are not seeking anyone else in relation to this case.
“We would again like to reassure the community that this appears to be an isolated incident.”
He says police have not ruled out further charges.
Anyone with information about the incident can call 105 or provide information at police.govt.nz/use-105, using Update My Report and the file number 240304/6284.
Information can also be provided anonymously via Crime Stoppers on 0800 555 111.